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        <title>Filters API</title>
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        <p>
            Filters API/SPI provides filtering features, how to create subgraph.
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        <p>
            The API let users create and combine filter queries and execute them
            on the current graph. The aim is to filter the graph (i.e. remove
            elements according to filter functions). The system works with Graph
            API and its view concept. New filters can easily be added.
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        <p>
            Filters me be defined as explained in <code>org.gephi.filters.spi</code>.
            Difference is made between node filters, edge filters and operators.
            Categories are a simple way to classify filters in a hierarchy tree for
            displaying it to users.
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